Stone Tools: Acheulean
By José-Manuel Benito Álvarez (España) —> Locutus Borg - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=1605723
Named for Saint-Acheul in northern France, the Acheulean, or Mode II is characterized by pear-shaped and oval tools and lasted from about 1,950,000 through about 125,000 years ago, with pockets that continued until about 50,000 years ago. These dates are based on dating volcanic ash or by testing the magnetostratigraphy, that is checking the alignment of magnetic minerals deposited to find out where the north pole was at the time they were laid down, or dating of organic material in the same layers as the tools were found. Based on these techniques, it appears that Acheulean tools originated in Africa and spread through Eurasia by 800,000 years ago.
One of the major improvements of the Acheulean tools over the Oldowan is the use of a 'soft hammer' that could be made of wood, bone, or antler, allowing more control over how the tool is finished and allowing for dulled tools to be resharpened. The tools were worked on both sides, allowing large flakes to be processed into tools as well as the cores that the Oldowan used.
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To make these tools, large flakes would be removed by a hammerstone, as with the Oldowan tools, but this would be taken a step further to work both faces of the core, with smaller flakes being removed, working to the soft hammer to remove thinner and smaller flakes to reach the desired shape. This would require the toolmaker to consider several steps ahead and to appropriately judge the flaws of the material they were using to successfully knap a tool.
Researchers have found collections of hundreds of tools, many too large to be used easily, and many unused, as far as we can tell. Knowing exactly why this happened is not possible, but researchers have a few theories as to why this happened. It might have been that these tools held some type of social clout. They might have played a part in identity or that they were a display of skill and prowess and were discarded once their purpose was met. This led one researcher to refer to these tools as 'the first commodity: A marketable good or service that has value and is used as an item for exchange'.
Homo ergaster and H heidelbergensis used Acheulean tools extensively, though they were used by H neanderthalensis and early H sapiens. It's thought that the tools also indicate that those who used them had some facility for language as their symmetry and the parts of the brain that allow for the fine, controlled movements to create such symmetry are closely tied to those parts of the brain that are used for speech. Support for artistic, and thus symbolic, expression comes from Venus figures, such as the Venus of Berekhat Ram and evidence of ochre use as found in Kapthurin, Kenya, and Duinefontein, South Africa.














